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为选择理想的新型燃烧稳定剂，研究了WB、WC、ZrB2、ZrO2、SiC和BN对浇铸RDX-CMDB推进剂燃速和燃速压力指数的影响。结果表明，6种材料都能降低推进剂的燃速，但降低幅度各有差异；ZrB2、ZrO2和SiC对推进剂燃速的降低作用随其粒度的减小而增大；WB和WC在一定含量下可以降低推进剂18～20.5MPa下的燃速压力指数；只有BN使推进剂的燃烧平台效应消失。
单、双环腔燃烧室燃烧性能的对比
燃烧室设计 单环腔燃烧室 双环腔燃烧室 燃烧数值模拟
2012/11/23
保持单环腔主燃烧室的扩压器，外机匣最大直径尺寸以及喷口不变的前提下，将其火焰筒结构重新设计为并联式双环腔结构,设计了6种不同旋流器组合的双环腔结构燃烧室.采用相同的物理模型(包括湍流模型、辐射模型、喷雾模型及污染排放模型等)，对单、双环腔主燃烧室分别进行全流程的三维计算.给出了燃烧室的总压恢复系数、燃烧效率、燃烧室出口温度分布系数、污染排放指标等燃烧室性能参数.对比分析了单、双环腔燃烧室的计算结果...
煤燃烧前温和热解汞和硫的释放特性研究
温和热解 脱硫 脱汞 微氧化性气氛
2009/11/17
以2种贵州典型的高汞高硫煤为研究对象，对煤中汞和硫的含量及其赋存形态进行了研究。并利用水平管式炉试验台，在惰性气体气氛和微氧化性气氛下对煤样进行燃烧前温和热解试验，研究煤样在温和热解过程中汞的释放规律及其汞硫联合脱除特性。研究表明2种实验煤样在350~400 ℃温度下脱汞率最大分别达到89.5%和82.8%，煤中汞的释放率在热解15 min左右达到极限值；同时还发现在微氧化性气氛下温和热解煤...
为深入揭示飞灰与汞的作用机制, 采用固定床汞吸附脱附实验系统详细研究了飞灰对汞的吸附氧化作用, 尤其是单一气氛下飞灰本身对汞的吸附氧化性能, 评价了飞灰中汞的脱附和析出形态, 结果表明: 飞灰自身对汞有明显的氧化作用, 依据飞灰吸附脱附汞形态差异, 构建了飞灰与汞作用活性点的分类, 提出了3种飞灰氧化汞的反应机制; 酸性气体对促进汞氧化、提高飞灰与汞的作用产物的稳定性有重要意义; 晶格氧是飞灰氧化...
醋酸液相氧化燃烧反应动力学
醋酸 燃烧反应 反应速率常数
2009/11/12
以醋酸钴、醋酸锰为主催化剂，溴化钾为促进剂，乙酸钾为助催化剂，在半连续搅拌釜式钛材反应器中通过测定尾气中CO2和CO的生成量，对醋酸的液相催化氧化动力学进行了研究. 分别考察了空气流量、温度、催化剂总浓度、[Co]/[Mn]比、溴离子浓度、水含量等因素对醋酸燃烧损失速率的影响. 实验结果表明，增加催化剂总浓度和[Co]/[Mn]比能明显加快CO2和CO的生成速率常数，提高溴离子浓度和降低反应温度可...
Co-combustion of biomass or waste together with a base fuel in a boiler is a simple and economically suitable way to replace fossil fuels by biomass and to utilise waste. Co-combustion in a high-effic...
COMPARISON OF CALCULATION METHODS FOR SMOKE AND HEAT EVACUATION FOR ENCLOSURE FIRES IN LARGE COMPARTMENTS
enclosure fires smoke and heat evacuation calculation methods
2009/10/14
A comparative study is presented of different calculation methods with respect to the evacuation of smoke and heat in the case of enclosure fires in large compartments. These methods range from manual...
The paper presents overview of the current state of fire suppression studies. Focus is made on water-based fire protection technology, such as sprinklers and mist systems. Mechanisms of suppression an...
The research presented consists of a study of the burning characteristics of a liquid fuel floating on water with emphasis in the phenomena known as boilover. The problem is of technical interest in t...
LARGE-SCALE POOL FIRES
pool fire spill fire radiation
2009/10/14
A review of research into the burning behaviour of large pool fires and fuel spill fires is presented. The features which distinguish such fires from smaller pool fires are mainly associated with the ...
THE EFFECT OF SURFACE REGRESSION ON THE DOWNWARD FLAME SPREAD OVER A SOLID FUEL IN A QUIESCENT AMBIENT
flame spread polymethyl methacrylate surface regression
2009/10/14
The present work is addressed to the numerical study of the transient laminar opposed-flow flame spread over a solid fuel in a quiescent ambient. The transient governing equations - full Navier-Stokes...
RECOMMENDATION OF TESTS FOR ASSESSING FLAME SPREAD OF MATERIALS IN HONG KONG
flame spread standard tests assessment
2009/10/14
Performance-based design for passive building fire safety provisions is accepted by the authority in Hong Kong since 1998. This is also known as the "fire engineering approach", though the performance...
Neutronic Analysis of Flux Dispersion in a Multi-Layered,(D-T) Driven Hybrid Blanket
Hybrid Blanket Fission Fusion Multi-Layer Blanket Fissile and Fusile Breeding
2009/10/14
The concept of `hybrid blanket' is based on the placement of the nuclear fuel layer, which is a fertile material and fissionable by the fusion neutrons, at the front or the rear sides of the tritium b...
COMPARISON OF OXYGEN CARRIERS FOR CHEMICAL-LOOPING COMBUSTION
Chemical-looping combustion CO2 capture oxygen-carriersfile
2009/10/13
Chemical-looping combustion is a combustion technology with inherent separation of the greenhouse gas CO2. This technique involves combustion of fossil fuels by means of an oxygen carrier which transf...